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<h3 class="docSection1Title">Systems Used to Test the Examples</h3>
<p class="docText"><a name="idd1e1246"></a><a name="idd1e1249"></a><a name="idd1e1252"></a><a name="idd1e1257"></a><a name="idd1e1262"></a><a name="idd1e1265"></a><a name="idd1e1268"></a><a name="idd1e1271"></a><a name="idd1e1274"></a><a name="idd1e1277"></a><a name="idd1e1280"></a><a name="idd1e1283"></a><a name="idd1e1286"></a><a name="idd1e1289"></a><a name="idd1e1292"></a><a name="idd1e1295"></a><a name="idd1e1298"></a><a name="idd1e1305"></a>Unfortunately all operating systems are moving targets. Unix is no exception. The following diagram shows the recent evolution of the various versions of System V and 4.xBSD.</P>
<p class="docText"><div class="v1"><a target="_self" href="images/0201433079/graphics/xxviifig01_alt.gif;423615">[View full size image]</a></div><img border="0" alt="" width="500" height="148" SRC="images/0201433079/graphics/xxviifig01.gif;423615"></P>
<p class="docText">4.xBSD are the various systems from the Computer Systems Research Group at the University of California at Berkeley. This group also distributes the BSD Net 1 and BSD Net 2 releasespublicly available source code from the 4.xBSD systems. SVRx refers to System V Release x from AT&amp;T. XPG3 is the X/Open Portability Guide, Issue 3, and ANSI C is the ANSI standard for the C programming language. POSIX.1 is the IEEE and ISO standard for the interface to a Unix-like system. We'll have more to say about these different standards and the various versions of Unix in <a class="docLink" href="ch02lev1sec2.html#ch02lev1sec2">Sections 2.2</a> and <a class="docLink" href="ch02lev1sec3.html#ch02lev1sec3">2.3</a>.</p>
<blockquote>
<p class="docText"><span class="docEmphStrong">In this text we use the term</span> <span class="docEmphBoldItalic">4.3+BSD</span> <span class="docEmphStrong">to refer to the Unix system from Berkeley that is somewhere between the BSD Net 2 release and 4.4BSD.</span></P>
<p class="docText">At the time of this writing, 4.4BSD was not released, so the system could not be called 4.4BSD. Nevertheless a simple name was needed to refer to this system and <span class="docEmphasis">4.3+BSD</span> is used throughout the text.</P>
</blockquote>
<p class="docText">Most of the examples in this text have been run on four different versions of Unix:</P>
<div style="font-weight:bold"><ol class="docList" type="1"><li><div style="font-weight:normal"><p class="docList">Unix System V/386 Release 4.0 Version 2.0 (&quot;vanilla SVR4&quot;) from U.H. Corp. (UHC), on an Intel 80386 processor.</P></div></LI><LI><div style="font-weight:normal"><p class="docList">4.3+BSD at the Computer Systems Research Group, Computer Science Division, University of California at Berkeley, on a Hewlett Packard workstation.</p></div></LI><li><div style="font-weight:normal"><p class="docList">BSD/386 (a derivative of the BSD Net 2 release) from Berkeley Software Design, Inc., on an Intel 80386 processor. This system is almost identical to what we call 4.3+BSD.</P></div></LI><LI><div style="font-weight:normal"><p class="docList">SunOS 4.1.1 and 4.1.2 (systems with a strong Berkeley heritage but many System V features) from Sun Microsystems, on a SPARCstation SLC.</p></div></LI></ol></div>
<p class="docText">Numerous timing tests are provided in the text and the systems used for the test are identified.</P>

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